Collisionless slow shocks in magnetotail reconnection

Details Collisionless slow shocks in magnetotail reconnection Collisionless slow shocks in magnetotail reconnection

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2709c&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 17, p. 2709-2712

Physics

Plasma Physics

5

Magnetospheric Physics: Magnetotail, Space Plasma Physics: Magnetic Reconnection, Space Plasma Physics: Numerical Simulation Studies, Space Plasma Physics: Waves And Instabilities

Scientific paper

The kinetic structure of collisionless slow shocks in the magnetotail is studied by solving the Riemann problem of the collapse of a current sheet with a normal magnetic field component using 2-D hybrid simulations. The collapse results in a current layer with a hot isotropic distribution and backstreaming ions in a boundary layer. The lobe plasma outside and within the boundary layer exhibits a large perpendicular to parallel temperature anisotropy. Waves in both regions propagate parallel to the magnetic field. In a second experiment a spatially limited high density beam is injected into a low beta background plasma and the subsequent wave excitation is studied. A model for slow shocks bounding the reconnection layer in the magnetotail is proposed where backstreaming ions first excite obliquely propagating waves by the electromagnetic ion/ion cyclotron instability, which lead to perpendicular heating. The T⊥/T∥ temperature anisotropy subsequently excites parallel propagating Alfvén ion cyclotron waves, which are convected into the slow shock and are refracted in the downstream region.

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